Study on the Second-Harmonic Generation of YCa4O(BO3)3 Crystals along Various Phase-Matching Directions

Abstract

Large size and high-quality YCa 4 O(BO 3 ) 3 (YCOB) crystal can be grown using the conventional Czochralski pulling method. The theoretical calculations of the effective coefficient (d eff ) and the walk-off angles at 530 nm of YCOB along various phase-matching (PM) directions are reported. The PM direction along (q = 64.5 , j = 144.5 ) for YCOB crystal has the largest d eff . Secondharmonic generation (SHG) experiments were performed on YCOB crystal along various PM directions. The results show that in 6 mm long YCOB crystal, the SHG conversion efficiency is 39% along the PM direction (q = 64.5 , j = 144.5 ) at 80 MW/cm 2 input power density, which is larger than that along (q = 64.5 , j = 35.5 ) and the PM direction in the XZ main plane. The experimental result is in good agreement with the theoretical calculations.

High-efficiency broadband second-harmonic-generation of YCa4O(BO3)3 crystal

“…According to the previous research results, 17,18) the maximum d eff in YCOB crystal appears at θ = 113°around. This direction is close to the x-y (θ = 90°) plane.…”